Addison Wesley Chemistry 11 by Geoff Rayner-Canham et el.

By Geoff Rayner-Canham et el.

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Note that the oxygen is written first because it is the accepted convention to write the least electronegative element first. Multiple Covalent Bonds Investigation Refer to page 67, Investigation 1 To provide complete octets, the sharing of more than 1 pair of electrons is sometimes necessary. This is called forming multiple bonds. If 2 pairs of electrons are shared, a double bond is formed, while a triple bond involves the sharing of 3 pairs of electrons. An example of a molecule containing double bonds is carbon dioxide.

Suppose you are a marketing manager for a shipping company that is willing to transport alkali metals. 2) Trends in Periodicity You are a research chemist with one of the nuclear physics groups who is synthesizing new elements. The group members hope to prepare enough atoms of elements 116, 118, and 119 to be able to measure their physical properties. But how will you know if you really have made these elements? You recall the predictable concept of periodic properties and decide to extrapolate plots of melting and boiling points and densities to determine the likely values.

Calcium ions are particularly important for bone formation, and a major health problem is calcium deficiency. With insufficient calcium ion intake, a porous bone structure is formed, leading to easily fractured bones together with the development of the disease osteoporosis. Although most people have heard of the importance of the Naϩ, Kϩ, Mg2ϩ, and Ca2ϩ ions, not as many are aware that the zinc ion, Zn2ϩ, is another essential ion. Our bodies rely on enzymes to speed up the chemical reactions that take place within our bodies.

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